CN204595308U - Imaging lens system and comprise the camera head of imaging lens system - Google Patents
Imaging lens system and comprise the camera head of imaging lens system Download PDFInfo
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- CN204595308U CN204595308U CN201520128018.XU CN201520128018U CN204595308U CN 204595308 U CN204595308 U CN 204595308U CN 201520128018 U CN201520128018 U CN 201520128018U CN 204595308 U CN204595308 U CN 204595308U
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- 230000003287 optical effect Effects 0.000 claims description 83
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- 201000009310 astigmatism Diseases 0.000 abstract description 26
- 238000004904 shortening Methods 0.000 abstract description 12
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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Abstract
The utility model provides a kind of imaging lens system and comprises the camera head of imaging lens system.Imaging lens system comprises in fact 6 lens, namely sequentially comprise from object side: there is positive refracting power and convex surface facing object side the 1st lens (L1), have negative refractive power the 2nd lens (L2), there is positive refracting power and the 3rd lens (L3) convex surface facing image side, have positive refracting power the 4th lens (L4), there are the 5th lens (L5) of positive refracting power and there are the 6th lens (L6) of negative refractive power, described imaging lens system meets defined terms formula.This imaging lens system can be revised astigmatism more well and reach the shortening of the lens overall length relative to picture size, wide viewing angleization and little f-number.
Description
Technical Field
The present invention relates to a fixed focus imaging lens (lens) for forming an optical image of a subject on an imaging Device such as a Charge Coupled Device (CCD) or a Complementary Metal Oxide Semiconductor (CMOS), a still digital camera (digital camera) or a mobile phone with a camera (camera), an information mobile terminal (personal digital assistant (PDA)), a smart phone (smart phone), a tablet terminal, and a portable game machine, which are equipped with the lens for imaging.
Background
With the spread of personal computers (personal computers) to general households and the like, still digital cameras capable of inputting image information such as photographed scenery or figures to personal computers have rapidly spread. In addition, many mobile phones, smart phones, or tablet terminals are equipped with camera modules (camera modules) for inputting images. In such an apparatus having an image pickup function, an image pickup device such as a CCD or a CMOS can be used. In recent years, these image pickup elements have been increasingly downsized (compact), and accordingly, the entire image pickup apparatus and the image pickup lens mounted therein are also required to have compact characteristics. Further, the imaging element is also becoming higher in pixel, and the imaging lens is required to have high resolution and high performance. For example, it is required to have a performance capable of coping with high pixels of 5 million pixels (megapixels) or more, more preferably 8 million pixels or more.
In order to meet the above requirements, there have been proposed an imaging lens having a 5-piece structure in which the number of lenses is relatively large, and an imaging lens having 6 or more lenses in which the number of lenses is increased in order to further improve performance. For example, the following patent documents 1 to 6 propose an imaging lens having a 6-piece structure.
[ Prior art documents ]
[ patent document ]
[ patent document 1] Taiwan patent application publication No. 201331663
[ patent document 2] Taiwan patent application publication No. 201300871
[ patent document 3] specification of U.S. patent application publication No. 2013003193
[ patent document 4] specification of U.S. patent application publication No. 2012314301
[ patent document 5] U.S. patent application publication No. 2012262806 specification
[ patent document 6] Korean patent No. 10-2011-
SUMMERY OF THE UTILITY MODEL
[ problem to be solved by the utility model ]
On the other hand, particularly for an imaging lens having a short total lens length used in a mobile terminal, a smartphone, a tablet terminal, or the like, there are increasing demands for a wide viewing angle and a smaller aperture value (F-number) in addition to a demand for shortening the total lens length.
However, the imaging lenses described in patent documents 2 to 6 have a large aperture value, a small angle of view, and an excessively long total lens length with respect to an image size (image size), and it is difficult to respond to all of the above requirements. In order to satisfy all of the above requirements, the imaging lens described in patent document 1 is required to correct astigmatism more favorably and to shorten the total lens length.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an imaging lens that can correct astigmatism more favorably, achieve a reduction in the total lens length for an image size, a wide viewing angle, and a small aperture value, and can achieve high imaging performance from a central angle of view to a peripheral angle of view in response to an imaging element that satisfies a high pixelation requirement, and an imaging device that can obtain a captured image with high resolution by mounting the imaging lens.
[ means for solving problems ]
The utility model discloses a 1 st camera lens, it is 6 lenses to contain substantially, includes according to the preface from the object side promptly: a 1 st lens having positive refractive power and a convex surface facing an object side; a 2 nd lens having a negative refractive power; a3 rd lens having positive refractive power and a convex surface facing the image side; a 4 th lens having a positive refractive power; a 5 th lens having a positive refractive power; and a 6 th lens having a negative refractive power; the imaging lens satisfies the following conditional expression (1-1):
2.6＜f3/f＜15 (1-1)
wherein,
f is the focal length of the whole system;
f3 is the focal length of the 3 rd lens.
The utility model discloses a 2 nd camera lens, it essentially contains 6 lenses, includes according to the preface from the object side promptly: a 1 st lens having positive refractive power and a convex surface facing an object side; a 2 nd lens having negative refractive power and a concave surface facing the object side; a3 rd lens having positive refractive power and a convex surface facing the image side; a 4 th lens having a positive refractive power; a 5 th lens having positive refractive power and a concave surface facing the object side; and a 6 th lens having a biconcave shape.
In addition, in the imaging lens of the present invention, the phrase "including 6 lenses" in the imaging lens 1 and the imaging lens 2 includes the case where the imaging lens of the present invention includes, in addition to the 6 lenses, a lens having substantially no power (power), an optical element other than a lens such as a diaphragm or cover glass (cover glass), a lens flange (lens barrel), a lens barrel (barrel), an imaging element, a shake correction mechanism, and the like. In addition, regarding a lens including an aspherical surface, the shape of the lens surface or the sign of the refractive power is considered in the paraxial region.
The utility model discloses an among 1 st camera lens and the 2 nd camera lens, satisfy through further adopting following preferred constitution, enable optical property better.
In the 1 st image pickup lens of the present invention, it is preferable that the 2 nd lens has a concave surface facing the object side.
In the imaging lens of claim 1, the 6 th lens is preferably biconcave.
Further, in the 1 st and 2 nd imaging lenses of the present invention, it is preferable that the imaging lens further includes an aperture stop disposed on the object side of the object side surface of the 2 nd lens.
The 1 st imaging lens of the present invention may satisfy any one of the following conditional expressions (1-2) to (1-3), conditional expressions (2) to (2-1), conditional expressions (3) to (3-1), conditional expressions (4) to (4-1), conditional expressions (5) to (5-1), conditional expressions (6) to (6-1), and conditional expression (8), or may satisfy any combination thereof. The 2 nd imaging lens of the present invention may satisfy any one of the following conditional expression (1), conditional expression (1-2), conditional expression (1-3), conditional expression (2) to conditional expression (2-1), conditional expression (3) to conditional expression (3-1), conditional expression (4) to conditional expression (4-1), conditional expression (5) to conditional expression (5-1), conditional expression (6) to conditional expression (6-1), and conditional expression (8), or may satisfy any combination thereof. In the 1 st and 2 nd imaging lenses according to the present invention, it is preferable that the conditional expression (7) is satisfied when the conditional expression (6) is satisfied, and it is also preferable that the conditional expression (7) is satisfied when the conditional expression (6-1) is satisfied.
1＜f3/f＜25 (1)
2.65＜f3/f＜9 (1-2)
2.7＜f3/f＜6 (1-3)
f234/f＜-2.15 (2)
f234/f＜-2.2 (2-1)
0.23＜f/f3+f/f4＜0.8 (3)
0.25＜f/f3+f/f4＜0.65 (3-1)
1.4＜f34/f＜3 (4)
1.6＜f34/f＜2.9 (4-1)
-550＜L2f/f＜-3.3 (5)
-300＜L2f/f＜-3.5 (5-1)
1.1＜CT3/CT4＜5 (6)
1.3＜CT3/CT4＜4 (6-1)
ν3＞ν4 (7)
0.5＜f·tanω/L6r＜20 (8)
f is the focal length of the whole system;
f3 is the focal length of the 3 rd lens;
f4 is the focal length of the 4 th lens;
f234 is the combined focal length of the 2 nd lens to the 4 th lens;
f34 is the combined focal length of the 3 rd lens and the 4 th lens;
l2f is the paraxial radius of curvature of the object-side surface of the 2 nd lens;
CT3 is the thickness of the 3 rd lens on the optical axis;
CT4 is the thickness of the 4 th lens on the optical axis;
ν 3 is the abbe number of the 3 rd lens relative to d-line;
ν 4 is an abbe number of the 4 th lens relative to d-line;
ω is a half value of the maximum angle of view in a state of focusing on an object at infinity;
l6r denotes a paraxial radius of curvature of the image-side surface of the 6 th lens element.
The utility model discloses a camera device includes the utility model discloses a 1 st camera lens or 2 nd camera lens.
[ effects of the utility model ]
According to the 1 st and 2 nd imaging lenses of the present invention, in the overall 6-piece lens structure, the structure of each lens element is optimized, so that it is possible to realize a lens system capable of correcting astigmatism more favorably, achieving a reduction in the total lens length with respect to the image size, a wide viewing angle, and a small aperture value, and having high imaging performance from the central viewing angle to the peripheral viewing angle in response to an imaging element that satisfies high pixelation requirements.
Further, according to the present invention, since the imaging device is configured to output the imaging signal corresponding to the optical image formed by any of the 1 st and 2 nd imaging lenses having high imaging performance, a high-resolution captured image can be obtained.
Drawings
Fig. 1 is a view showing a 1 st configuration example of an imaging lens according to an embodiment of the present invention, and is a lens cross-sectional view corresponding to example 1.
Fig. 2 is a view showing a configuration example 2 of an imaging lens according to an embodiment of the present invention, and is a lens cross-sectional view corresponding to example 2.
Fig. 3 is a view showing a3 rd configuration example of an imaging lens according to an embodiment of the present invention, and is a lens cross-sectional view corresponding to example 3.
Fig. 4 is a view showing a 4 th configuration example of an imaging lens according to an embodiment of the present invention, and is a lens cross-sectional view corresponding to example 4.
Fig. 5 is a view showing a 5 th configuration example of an imaging lens according to an embodiment of the present invention, and is a lens cross-sectional view corresponding to example 5.
Fig. 6 is a view showing a 6 th configuration example of an imaging lens according to an embodiment of the present invention, and is a lens cross-sectional view corresponding to example 6.
Fig. 7 is an optical path diagram of the imaging lens shown in fig. 1.
Fig. 8 is an aberration diagram showing aberrations of the imaging lens according to embodiment 1 of the present invention, and shows spherical aberration, astigmatism, distortion aberration, and magnification chromatic aberration in this order from the left.
Fig. 9 is an aberration diagram showing aberrations of the imaging lens according to embodiment 2 of the present invention, and shows spherical aberration, astigmatism, distortion aberration, and magnification chromatic aberration in this order from the left.
Fig. 10 is an aberration diagram showing aberrations of an imaging lens according to embodiment 3 of the present invention, and shows spherical aberration, astigmatism, distortion aberration, and magnification chromatic aberration in this order from the left.
Fig. 11 is an aberration diagram showing aberrations of the imaging lens according to embodiment 4 of the present invention, and shows spherical aberration, astigmatism, distortion aberration, and magnification chromatic aberration in this order from the left.
Fig. 12 is an aberration diagram showing aberrations of the imaging lens according to embodiment 5 of the present invention, and shows spherical aberration, astigmatism, distortion aberration, and magnification chromatic aberration in this order from the left.
Fig. 13 is an aberration diagram showing aberrations of the imaging lens according to embodiment 6 of the present invention, and shows spherical aberration, astigmatism, distortion aberration, and magnification chromatic aberration in this order from the left.
Fig. 14 is a diagram showing an image pickup device as a mobile phone terminal including the image pickup lens of the present invention.
Fig. 15 is a diagram showing an imaging device as a smartphone including an imaging lens according to the present invention.
[ description of symbols ]
1. 501: image pickup apparatus
2: on-axis light beam
3: maximum angle of view beam
4: chief ray
100: image pickup device
541: camera part
CG: optical member
D1-D15: surface interval
L: image pickup lens
L1-L6: no. 1 to No. 6 lenses
R1-R15: radius of curvature
R16: image plane
St: aperture diaphragm
Z1: optical axis
ω: half value of maximum viewing angle
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Fig. 1 shows a 1 st configuration example of an imaging lens according to a 1 st embodiment of the present invention. This configuration example corresponds to the lens configuration of numerical example 1 (table 1, table 2) described later. Similarly, fig. 2 to 6 show cross-sectional structures of the 2 nd to 6 th structural examples corresponding to the lens structures of numerical examples (tables 3 to 12) in the 2 nd to 6 th embodiments described later. In fig. 1 to 6, reference symbol Ri denotes a curvature radius of the i-th surface marked with a symbol so that the surface of the lens element closest to the object side increases in order toward the image side (image forming side) with the 1 st surface. Symbol Di denotes a surface interval between the ith surface and the (i + 1) th surface on the optical axis Z1. Since the basic configuration is the same in each configuration example, the following description will be given based on the configuration example of the imaging lens shown in fig. 1, and also the configuration examples of fig. 2 to 6 will be described as necessary. Fig. 7 is an optical path diagram of the imaging lens shown in fig. 1, and shows optical paths of the on-axis light flux 2 and the maximum angle of view light flux 3 in a state of being focused on an object at infinity, and a half value ω of the maximum angle of view. In the maximum-view-angle beam 3, the principal ray 4 of the maximum view angle is indicated by a chain of dots.
The imaging lens L according to the embodiment of the present invention is suitably used in various imaging devices using an imaging element such as a CCD or a CMOS, particularly in relatively small mobile terminal devices such as a still camera, a camera-equipped mobile phone, a smartphone, a tablet terminal, and a PDA. The imaging lens L includes, in order from the object side along an optical axis Z1: the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6.
Fig. 14 shows a schematic view of a mobile phone terminal as the imaging device 1 according to the embodiment of the present invention. The imaging device 1 according to the embodiment of the present invention includes the imaging lens L according to the embodiment, and an imaging element 100 such as a CCD (see fig. 1) that outputs an imaging signal corresponding to an optical image formed by the imaging lens L. The image pickup element 100 is disposed on an image formation surface (an image surface R16 in fig. 1 to 6) of the image pickup lens L.
Fig. 15 shows a schematic diagram of a smartphone, which is an imaging device 501 according to an embodiment of the present invention. The image pickup device 501 according to the embodiment of the present invention includes a camera portion 541, and the camera portion 541 includes the image pickup lens L according to the embodiment and an image pickup element 100 such as a CCD (see fig. 1) that outputs an image pickup signal corresponding to an optical image formed by the image pickup lens L. The image pickup device 100 is disposed on an image formation surface (image pickup surface) of the image pickup lens L.
Between the 6 th lens L6 and the image pickup element 100, various optical members CG may be arranged according to the configuration of the camera side to which the lens is attached. For example, a flat-plate-shaped optical member such as a cover glass or an infrared cut filter (infrared cut filter) for protecting an imaging surface may be disposed. In this case, as the optical member CG, for example, there may be used: a flat plate-shaped cover glass is coated with a coating (coat) having a filter effect such as an infrared cut filter or a Neutral Density (ND) filter, or a material having the same effect.
Further, instead of using the optical member CG, the 6 th lens L6 may be coated to have the same effect as the optical member CG. This can reduce the number of parts and the overall length.
Further, the image pickup lens L preferably includes an aperture stop St disposed on the object side of the object-side surface of the 2 nd lens L2. When the aperture stop St is arranged in this manner, an incident angle of the light passing through the optical system to the imaging surface (image pickup element) can be suppressed from becoming large particularly in the peripheral portion of the imaging region. The "position on the object side of the object-side surface of the 2 nd lens L2" means that the position of the aperture stop in the optical axis direction is the same as the intersection of the axial upper edge (margin) ray and the object-side surface of the 2 nd lens L2, or is on the object side of the position. To further enhance this effect, it is preferable that aperture stop St is disposed on the object side of the object-side surface of 1 St lens L1. The phrase "disposed on the object side surface of the 1 st lens L1" means that the position of the aperture stop in the optical axis direction is the same as the intersection of the on-axis edge ray and the object side surface of the 1 st lens L1, or is on the object side surface of the position.
Further, the aperture stop St may be disposed between the 1 St lens L1 and the 2 nd lens L2. In this case, the total length can be reduced, and aberrations can be corrected with good balance by the lens disposed on the object side of the aperture stop St and the lens disposed on the image side of the aperture stop St. In the present embodiment, the lenses of configuration examples 1 to 6 (fig. 1 to 6) are configuration examples in which the aperture stop St is disposed between the 1 St lens L1 and the 2 nd lens L2. Further, the aperture stop St shown here does not necessarily indicate a size or a shape, but indicates a position on the optical axis Z1.
In the imaging lens L, the 1 st lens L1 has positive refractive power in the vicinity of the optical axis. Therefore, the total lens length can be advantageously shortened. The 1 st lens L1 has a convex surface facing the object side in the vicinity of the optical axis. In this case, it is easy to sufficiently increase the positive refractive power of the 1 st lens L1 that performs the main imaging function of the imaging lens L, and the total lens length can be further reduced. Further, the 1 st lens L1 is preferably biconvex in the vicinity of the optical axis. At this time, the positive refractive power of the 1 st lens L1 can be appropriately secured and generation of spherical aberration can be suppressed. The 1 st lens L1 may have a concave-convex (meniscus) shape with its convex surface facing the object side in the vicinity of the optical axis. In this case, the total length can be appropriately shortened.
Further, the 2 nd lens L2 has negative refractive power in the vicinity of the optical axis. This makes it possible to correct chromatic aberration and spherical aberration satisfactorily. Further, the 2 nd lens L2 preferably has a concave surface facing the object side in the vicinity of the optical axis. In this case, astigmatism and chromatic aberration can be corrected more favorably. Further, the 2 nd lens L2 is preferably formed in a biconcave shape in the vicinity of the optical axis. In this case, the negative refractive power of the 2 nd lens L2 can be sufficiently secured, and each aberration generated in the 1 st lens L1 having a positive refractive power can be appropriately corrected, which contributes to shortening the total lens length.
Preferably, the 3 rd lens L3 has positive refractive power in the vicinity of the optical axis. At this time, by sharing the positive refractive power between the 1 st lens L1 and the 3 rd lens L3, the positive refractive power of the imaging lens L can be sufficiently enhanced, and the spherical aberration can be corrected satisfactorily. Further, the 3 rd lens L3 preferably has a convex surface facing the image side in the vicinity of the optical axis. In this case, the occurrence of astigmatism can be suppressed. Further, the 3 rd lens L3 is preferably biconvex near the optical axis. At this time, the positive refractive power of the 3 rd lens L3 can be secured and generation of spherical aberration can be suppressed.
The 4 th lens L4 has positive refractive power in the vicinity of the optical axis. This makes it possible to correct astigmatism and field curvature satisfactorily. Further, the 4 th lens L4 can be formed into a biconvex shape in the vicinity of the optical axis. In this case, spherical aberration and axial chromatic aberration can be corrected satisfactorily. The 4 th lens L4 may have a concave-convex shape with its convex surface facing the object side in the vicinity of the optical axis. In this case, the total lens length can be appropriately shortened. The 4 th lens element L4 may have an uneven shape with a convex surface facing the image side in the vicinity of the optical axis. In this case, the occurrence of astigmatism can be suppressed.
The 5 th lens L5 has positive refractive power in the vicinity of the optical axis. Therefore, the total length can be shortened, and the image plane aberration and the axial chromatic aberration can be corrected well. Further, by making the 5 th lens L5 have positive refractive power in the vicinity of the optical axis, the incident angle of the light rays passing through the imaging lens L to the imaging plane (imaging element) can be appropriately suppressed from becoming large, particularly at intermediate angles of view. Further, the 5 th lens L5 preferably has a concave surface facing the object side in the vicinity of the optical axis. In this case, the total lens length can be shortened and the viewing angle can be widened while suppressing the occurrence of astigmatism. Further, the 5 th lens L5 preferably has a concave-convex shape with the concave surface facing the object side in the vicinity of the optical axis. In this case, the occurrence of astigmatism can be further suppressed.
The 6 th lens L6 has negative refractive power near the optical axis. Thus, if the imaging lens L is regarded as a positive lens group including the 1 st lens L1 to the 5 th lens L5, and the imaging lens L is regarded as a negative lens group together with the 6 th lens L6, the imaging lens L can be configured as a telephoto (telephoto) type as a whole, and the rear principal point of the imaging lens L can be positioned closer to the object side, whereby the total lens length can be appropriately shortened. Further, by making the 6 th lens L6 have negative refractive power in the vicinity of the optical axis, field curvature can be corrected well.
Further, the 6 th lens L6 is preferably double concave near the optical axis. At this time, the negative refractive power of the 6 th lens L6 can be ensured, and the absolute value of the radius of curvature of the image-side surface of the 6 th lens L6 is suppressed from becoming excessively small, so that it is advantageous to shorten the total lens length with respect to the image size, and particularly, at an intermediate angle of view, it is possible to appropriately suppress an increase in the incident angle of the light ray passing through the imaging lens L onto the imaging surface (imaging element).
Further, it is preferable that the image-side surface of the 6 th lens L6 has an aspherical shape having at least 1 inflection point (inflection point) inward in the radial direction of the optical axis from the intersection of the image-side surface and the principal ray of the maximum angle of view. This can suppress an increase in the incident angle of the light beam passing through the optical system to the image forming surface (image pickup element), particularly in the peripheral portion of the image forming region. Further, distortion aberration can be corrected favorably by forming the image-side surface of the 6 th lens L6 into an aspherical shape having at least 1 inflection point inward in the radial direction of the optical axis from the intersection of the image-side surface and the principal ray of the maximum angle of view. The "inflection point" on the image-side surface of the 6 th lens L6 is a point at which the image-side surface shape of the 6 th lens L6 is switched from a convex shape to a concave shape (or from a concave shape to a convex shape) with respect to the image side. In the present specification, the phrase "radially inward of the optical axis from the intersection of the image-side surface and the principal ray of the maximum angle of view" means the same position as the intersection of the image-side surface and the principal ray of the maximum angle of view or radially inward of the optical axis from the intersection. The inflection point provided on the image-side surface of the 6 th lens L6 may be located at the same position as the intersection point of the image-side surface of the 6 th lens L6 and the principal ray at the maximum angle of view, or at an arbitrary position inward in the radial direction of the optical axis from this position.
When the 1 st lens L1 to the 6 th lens L6 constituting the imaging lens L are single lenses, the number of lens surfaces is larger than that when any one of the 1 st lens L1 to the 6 th lens L6 is a cemented lens, and therefore the degree of freedom in designing each lens can be increased, and the total length can be appropriately shortened.
According to the imaging lens L, the configuration of each lens element of the 1 st lens L1 to the 6 th lens L6 is optimized in the overall 6-piece lens structure, and therefore, a lens system having high imaging performance from a central angle of view to a peripheral angle of view can be realized that can achieve a wide angle of view while reducing the total length and that can meet the demand for high pixelation.
In order to achieve high performance of the imaging lens L, it is preferable that at least one surface of each of the 1 st lens L1 to the 6 th lens L6 is formed to have an aspherical shape.
Next, the operation and effect of the conditional expression of the imaging lens L configured as described above will be described in more detail. In addition, the imaging lens L preferably satisfies any one of or any combination of the following conditional expressions. The conditional expression to be satisfied is preferably selected appropriately according to the requirements for the imaging lens L.
Further, it is preferable that the focal length f3 of the 3 rd lens L3 and the focal length f of the entire system satisfy the following conditional expression (1):
1＜f3/f＜25 (1)。
a preferable numerical range of the ratio of the focal length f3 of the 3 rd lens L3 to the focal length f of the entire system is specified in the conditional expression (1). By maintaining the refractive power of the 3 rd lens L3 with respect to the refractive power of the entire system so as not to become the lower limit or less of the conditional expression (1), the positive refractive power of the 3 rd lens L3 does not become too strong with respect to the refractive power of the entire system, which is advantageous for achieving a wide angle of view and shortening the total lens length with respect to the image size. By suppressing the refractive power of the 3 rd lens L3 with respect to the refractive power of the entire system so as not to become the upper limit of the conditional expression (1) or more, the positive refractive power of the 3 rd lens L3 with respect to the refractive power of the entire system does not become excessively weak, and a small aperture value can be achieved and spherical aberration can be corrected satisfactorily. In order to further enhance the effect, it is preferable to satisfy the conditional expression (1-1), more preferable to satisfy the conditional expression (1-2), and even more preferable to satisfy the conditional expression (1-3):
2.6＜f3/f＜15 (1-1)
2.65＜f3/f＜9 (1-2)
2.7＜f3/f＜6 (1-3)。
further, it is preferable that the combined focal length f234 of the 2 nd lens L2 to the 4 th lens L4 and the focal length f of the entire system satisfy the following conditional expression (2):
f234/f＜-2.15 (2)。
a preferable numerical range of the ratio of the combined focal length f234 of the 2 nd lens L2 to the 4 th lens L4 to the focal length f of the entire system is specified in the conditional expression (2). By ensuring the negative combined refractive power of the 2 nd lens L2 to the 4 th lens L4 so as not to exceed the upper limit of the conditional expression (2), the negative combined refractive power of the 2 nd lens L2 to the 4 th lens L4 does not become excessively weak with respect to the refractive power of the entire system, and the balance of the refractive power of the imaging lens L can be appropriately maintained, which is advantageous for shortening the total lens length. In order to further enhance the effect, it is preferable that the conditional formula (2-1) is satisfied:
f234/f＜-2.2 (2-1)。
further, it is preferable that the focal length f3 of the 3 rd lens L3, the focal length f4 of the 4 th lens L4, and the focal length f of the entire system satisfy the following conditional expression (3):
0.23＜f/f3+f/f4＜0.8 (3)。
a preferable numerical range of the sum of the ratio of the focal length f of the entire system to the focal length f3 of the 3 rd lens L3 and the ratio of the focal length f of the entire system to the focal length f4 of the 4 th lens L4 is specified in the conditional expression (3). By securing the refractive power of the 3 rd lens L3 and the refractive power of the 4 th lens L4 so as not to become the lower limit or less of the conditional expression (3), the refractive power of the 3 rd lens L3 and the refractive power of the 4 th lens L4 do not become excessively weak with respect to the refractive power of the entire system, and the total lens length can be appropriately shortened. By maintaining the refractive power of the 3 rd lens L3 and the refractive power of the 4 th lens L4 so as not to exceed the upper limit of the conditional expression (3), the refractive power of the 3 rd lens L3 and the refractive power of the 4 th lens L4 do not become excessively strong with respect to the refractive power of the entire system, and spherical aberration and astigmatism can be corrected well. In order to further enhance the effect, it is preferable that the conditional formula (3-1) is satisfied:
0.25＜f/f3+f/f4＜0.65 (3-1)。
further, it is preferable that the combined focal length f34 of the 3 rd lens L3 and the 4 th lens L4 and the focal length f of the entire system satisfy the following conditional expression (4):
1.4＜f34/f＜3 (4)。
a preferable numerical range of the ratio of the combined focal length f34 of the 3 rd lens L3 and the 4 th lens L4 to the focal length f of the entire system is specified in conditional expression (4). By maintaining the combined refractive power of the 3 rd lens L3 and the 4 th lens L4 so as not to become the lower limit or less of the conditional expression (4), the positive combined refractive power of the 3 rd lens L3 and the 4 th lens L4 does not become too strong with respect to the refractive power of the entire system, and spherical aberration and astigmatism can be corrected well. By securing the combined refractive power of the 3 rd lens L3 and the 4 th lens L4 so as not to exceed the upper limit of the conditional expression (4), the positive combined refractive power of the 3 rd lens L3 and the 4 th lens L4 does not become too weak with respect to the refractive power of the entire system, and the total lens length can be appropriately shortened. In order to further enhance the effect, it is preferable to satisfy the conditional expression (4-1), and it is more preferable to satisfy the conditional expression (4-2):
1.6＜f34/f＜2.9 (4-1)
1.85＜f34/f＜2.85 (4-2)。
further, it is preferable that the paraxial radius of curvature L2f of the object-side surface of the 2 nd lens L2 and the focal length f of the entire system satisfy the following conditional expression (5):
-550＜L2f/f＜-3.3 (5)。
the conditional expression (5) defines a preferable numerical range of the ratio of the paraxial radius of curvature L2f of the object-side surface of the 2 nd lens L2 to the focal length f of the entire system. By setting the paraxial radius of curvature L2f of the object-side surface of the 2 nd lens L2 so as not to become the lower limit of the conditional expression (5), the absolute value of the paraxial radius of curvature L2f of the object-side surface of the 2 nd lens L2 does not become excessively large, and spherical aberration and chromatic aberration can be sufficiently corrected. Further, by setting the paraxial radius of curvature L2f of the object-side surface of the 2 nd lens L2 so as not to become the upper limit of the conditional expression (5) or more, the absolute value of the paraxial radius of curvature L2f of the object-side surface of the 2 nd lens L2 does not become excessively small, which is advantageous in achieving a wide angle of view and shortening the total lens length. In order to further enhance the effect, it is preferable to satisfy the conditional expression (5-1), and it is even more preferable to satisfy the conditional expression (5-2):
-300＜L2f/f＜-3.5 (5-1)
-200＜L2f/f＜-3.7 (5-2)。
further, it is preferable that the imaging lens L satisfies both the following conditional expression (6) and conditional expression (7):
1.1＜CT3/CT4＜5 (6)
ν3＞ν4 (7)。
the conditional expression (6) specifies a preferable numerical range of the ratio of the thickness CT3 of the 3 rd lens L3 on the optical axis to the thickness CT4 of the 4 th lens L4 on the optical axis. The conditional expression (7) defines a preferable relationship between the abbe number ν 3 of the 3 rd lens L3 with respect to the d-line and the abbe number ν 4 of the 4 th lens L4 with respect to the d-line. The chromatic aberration can be corrected favorably by setting the abbe number ν 3 of the 3 rd lens L3 with respect to the d-line and the abbe number ν 4 of the 4 th lens L4 with respect to the d-line so as to satisfy the conditional expression (7), and setting the thickness CT3 of the 3 rd lens L3 with respect to the thickness CT4 of the 4 th lens L4 on the optical axis so as not to become the lower limit of the conditional expression (6) or less. Further, by setting the abbe number ν 3 of the 3 rd lens L3 with respect to the d-line and the abbe number ν 4 of the 4 th lens L4 with respect to the d-line so as to satisfy the conditional expression (7) and setting the thickness CT3 of the 3 rd lens L3 on the optical axis with respect to the thickness CT4 of the 4 th lens L4 on the optical axis so as not to become the upper limit of the conditional expression (6), it is easy to obtain balance between the chromatic aberration on the axis and the chromatic aberration of magnification. In order to further enhance the effect, it is more preferable that the conditional expression (6-1) and the conditional expression (7) are satisfied at the same time:
1.3＜CT3/CT4＜4 (6-1)。
further, it is preferable that the focal length f of the entire system, the half value ω of the maximum angle of view in a state of being focused on an infinitely distant object, and the paraxial radius of curvature L6r of the surface on the image side of the 6 th lens L6 satisfy the following conditional expression (8):
0.5＜f·tanω/L6r＜20 (8)。
the conditional expression (8) defines a preferable numerical range of the ratio of the paraxial radius of curvature L6r of the image-side surface of the 6 th lens element to the paraxial image height (f · tan ω). By setting the paraxial image height (f · tan ω) of the paraxial curvature radius L6r with respect to the image-side surface of the 6 th lens so as not to become the lower limit or less of the conditional expression (8), the absolute value of the paraxial curvature radius L6r of the image-side surface of the 6 th lens L6, which is the surface closest to the image side of the imaging lens, does not become excessively large with respect to the paraxial image height (f · tan ω), and the total lens length can be shortened and spherical aberration, axial chromatic aberration, and field curvature can be sufficiently corrected. As in the imaging lens L according to each embodiment, when the 6 th lens L6 is formed in an aspherical shape having a concave surface facing the image side and at least 1 inflection point, and satisfies the lower limit of the conditional expression (8), the field curvature from the central angle to the peripheral angle can be corrected favorably, and therefore, a wide angle is preferable. Further, by setting the paraxial radius of curvature L6r of the image-side surface of the 6 th lens element with respect to the paraxial image height (f · tan ω) so as not to become the upper limit of the conditional expression (8) or more, the absolute value of the paraxial radius of curvature L6r of the image-side surface of the 6 th lens element, which is the surface closest to the image side of the imaging lens element, with respect to the paraxial image height (f · tan ω) does not become excessively small, and particularly at an intermediate angle of view, it is possible to suppress an increase in the incident angle of the light beam passing through the optical system to the imaging surface (imaging element) and to suppress excessive correction of curvature of the image surface.
Here, 2 preferable configuration examples of the imaging lens L and effects thereof will be described. In addition, the preferable configuration of the imaging lens L can be appropriately adopted in all of the 2 preferable configuration examples.
First, the imaging lens L of the configuration example 1 substantially includes 6 lenses, that is, includes, in order from the object side: a 1 st lens having positive refractive power with a convex surface facing an object side, a 2 nd lens having negative refractive power, a3 rd lens having positive refractive power with a convex surface facing an image side, a 4 th lens having positive refractive power, a 5 th lens having positive refractive power, and a 6 th lens having negative refractive power, and the image pickup lens L satisfies conditional expression (1-1). According to the configuration example 1, particularly, spherical aberration can be corrected satisfactorily, and a wide viewing angle, shortening of the total lens length with respect to the image size, and a small aperture value can be realized.
On the other hand, for example, in the imaging lenses described in patent documents 1, 3, and 4, the corresponding value of the conditional expression (1-1) is smaller than the lower limit of the conditional expression (1-1), and therefore it is difficult to respond to both the requirements of a wide viewing angle and shortening of the total lens length with respect to the image size, and in the imaging lenses described in patent documents 2, 5, and 6, the corresponding value of the conditional expression (1-1) is larger than the upper limit of the conditional expression (1-1), and therefore it is difficult to achieve a required small aperture value.
The imaging lens L of the 2 nd configuration example substantially includes 6 lenses, that is, includes, in order from the object side: the zoom lens includes a 1 st lens having positive refractive power with a convex surface facing an object side, a 2 nd lens having negative refractive power with a concave surface facing the object side, a3 rd lens having positive refractive power with a convex surface facing an image side, a 4 th lens having positive refractive power, a 5 th lens having positive refractive power with a concave surface facing the object side, and a 6 th lens having a biconcave shape. According to the configuration example 2, particularly, since the concave surface of the 2 nd lens L2 faces the object side in the vicinity of the optical axis, astigmatism and chromatic aberration can be corrected favorably. Further, since the 5 th lens L5 has a concave surface facing the object side in the vicinity of the optical axis, it is possible to suppress the occurrence of astigmatism while achieving shortening of the total lens length and widening of the viewing angle. Further, since the 6 th lens L6 has a biconcave shape in the vicinity of the optical axis, the total lens length can be easily shortened with respect to the image size, and the incident angle of the light beam passing through the optical system to the image forming surface (image pickup element) can be suppressed from increasing at the intermediate angle of view.
On the other hand, in the imaging lenses described in patent documents 1 and 5, for example, the 2 nd lens has a convex surface facing the object side, and further favorable correction of astigmatism is required for the imaging performance required for realizing high pixelation of an imaging device such as a mobile phone terminal. Further, in the imaging lens described in patent document 2, the 5 th lens has a convex surface directed to the object side, and correction of astigmatism is insufficient, and therefore it is difficult to respond to the demand for shortening of the total lens length with respect to the image size and widening of the viewing angle. In the imaging lenses described in patent documents 3 and 4, the 6 th lens has a concave-convex shape, and the total length of the lens is not sufficiently reduced with respect to the image size.
As described above, according to the imaging lens L of the embodiment of the present invention, the configuration of each lens element is optimized in the overall 6-piece lens structure, and therefore, a lens system capable of achieving a reduction in the total lens length, a wide angle, and a small aperture value for an image size while correcting astigmatism more favorably, and having high imaging performance from the central angle of view to the peripheral angle of view in response to an imaging element that satisfies a high pixelation requirement can be realized.
Further, for example, when the lens configurations of the 1 st lens L1 to the 6 th lens L6 of the imaging lens L are set so that the maximum angle of view in a state of focusing on an object at infinity is 74 degrees or more as in the imaging lenses of embodiments 1 to 6, the imaging lens L can be suitably applied to an imaging device such as a mobile phone terminal. On the other hand, the maximum viewing angle 2 ω of the imaging lenses disclosed in patent documents 2 to 6 is small, ranging from 61 ° to 71 °, and it is difficult to respond to the requirement of a wide viewing angle of an imaging device such as a mobile phone terminal. Further, for example, the imaging lenses disclosed in patent documents 1 to 6 are configured such that the ratio TTL/ImgH of the distance TTL (back focal length is an air-converted length) on the optical axis from the object-side surface of the 1 st lens to the image forming surface to the image size ImgH is 1.61 to 2.02, and in each of the embodiments of the present specification, it is preferable to configure such that TTL/ImgH is 1.45 to 1.52, and therefore, it is possible to respond to the demand for the wide viewing angle of an imaging device such as a mobile phone terminal and the shortening of the total lens length to the image size at the same time. Further, for example, the imaging lenses disclosed in patent documents 1 to 6 are configured so that the aperture value is 2.2 to 2.9, and in each of the embodiments of the present specification, it is preferable to configure so that the aperture value is 2.1, which is advantageous in responding to a demand for higher pixelation.
Further, by satisfying appropriately preferable conditions, higher image forming performance can be achieved. Further, according to the imaging device of the present embodiment, since the imaging signal corresponding to the optical image formed by the high-performance imaging lens of the present embodiment is output, a high-resolution captured image from the central angle of view to the peripheral angle of view can be obtained.
Next, a specific numerical example of an imaging lens according to an embodiment of the present invention will be described. Hereinafter, a plurality of numerical examples will be collectively described.
Specific lens data (data) corresponding to the configuration of the imaging lens shown in fig. 1 is shown in tables 1 and 2 described later. In particular, the basic lens data are shown in table 1, and the data relating to aspherical surfaces are shown in table 2. In the column of the surface number Si in the lens data shown in table 1, the imaging lens of example 1 is represented by the number of the i-th surface which is denoted by the reference numeral such that the object-side surface of the optical element closest to the object side is the 1 st surface and increases in order toward the image side. In the column of the curvature radius Ri, a value (mm) of the curvature radius of the i-th surface from the object side is represented in correspondence with a symbol Ri denoted in fig. 1. The column of the surface interval Di also indicates the distance (mm) between the i-th surface Si and the i + 1-th surface Si +1 on the optical axis from the object side. The column Ndj shows the value of the refractive index of the jth optical element from the object side with respect to the d-line (wavelength 587.6 nm). The column ν dj represents a value of Abbe number (Abbe number) of the j-th optical element with respect to the d-line from the object side.
The aperture stop St and the optical member CG are also shown in table 1. In table 1, the column of the surface number corresponding to the surface of the aperture stop St is described as a surface number (St) and (IMG), and the column of the surface number corresponding to the surface of the image plane is described as a surface number (IMG). The sign of the curvature radius is that the surface shape of the convex surface toward the object side is regarded as positive, and the surface shape of the convex surface toward the image side is regarded as negative. In the upper part outside the frame of each lens data, the focal length f (mm), the back focus bf (mm), the aperture value fno, and the maximum angle of view 2 ω (°) in a state of being focused on an object at infinity are shown as each data. The back focus Bf represents an air-converted value.
In the imaging lens of example 1, both surfaces of the 1 st lens L1 to the 6 th lens L6 have aspherical shapes. In the basic lens data in table 1, numerical values of the curvature radius (paraxial curvature radius) near the optical axis are shown as the curvature radius of these aspherical surfaces.
Table 2 shows aspherical surface data of the imaging lens of example 1. In the numerical values expressed as aspherical surface data, the symbol "E" indicates a "power exponent" whose subsequent numerical value is a base 10, and indicates a numerical value obtained by multiplying the numerical value expressed by the exponential function with the base 10 by "E". For example, a value of "1.0E-02" means "1.0X 10-2”。
As the aspherical surface data, values of coefficients An and KA in An aspherical surface shape expression represented by the following expression (a) are described. More specifically, Z represents the length (mm) of a perpendicular line drawn from a point on the aspherical surface located at a height h from the optical axis to a tangent plane (plane perpendicular to the optical axis) to the apex of the aspherical surface.
[ number 1]
Wherein,
z: depth of aspheric surface (mm)
h: distance (height) (mm) from optical axis to lens surface
C: paraxial curvature of 1/R
(R: paraxial radius of curvature)
An: the nth (n is an integer of 3 or more) aspheric coefficient
KA: coefficient of aspheric surface
As with the imaging lens of example 1 described above, specific lens data corresponding to the configurations of the imaging lens shown in fig. 2 to 6 are shown in tables 3 to 12 as examples 2 to 6. In the imaging lenses of examples 1 to 6, both surfaces of the 1 st lens L1 to the 6 th lens L6 have aspherical shapes.
Fig. 8 shows aberration diagrams showing spherical aberration, astigmatism, distortion (distortion aberration), and chromatic aberration of magnification (chromatic aberration of magnification) of the imaging lens of example 1 in order from the left. Each aberration diagram showing spherical aberration, astigmatism (field curvature), and distortion (distortion aberration) shows aberration with the d-line (wavelength 587.6nm) as a reference wavelength, but the spherical aberration diagram also shows aberrations of the F-line (wavelength 486.1nm), C-line (wavelength 656.3nm), and g-line (wavelength 435.8nm), and the magnification chromatic aberration diagram shows aberrations of the F-line, C-line, and g-line. In the astigmatism diagrams, the solid line represents the aberration in the sagittal (sagittal) direction (S), and the broken line represents the aberration in the tangential (tangential) direction (T). Further, fno denotes an aperture value, and ω denotes a half value of a maximum angle of view in a state of focusing on an infinite object.
Similarly, respective aberrations with respect to the imaging lenses of embodiments 2 to 6 are shown in fig. 9 to 13. The aberration diagrams shown in fig. 9 to 13 are each a diagram when the object is at infinity.
In table 13, values related to the conditional expressions (1) to (8) of the present invention are shown in a summary for each of examples 1 to 6.
As is clear from the above numerical data and aberration diagrams, the embodiments achieve high imaging performance while achieving shortening of the total lens length and widening of the lens angle.
The imaging lens of the present invention is not limited to the embodiments and examples, and various modifications can be made. For example, the values of the radius of curvature, the surface interval, the refractive index, the abbe number, the aspherical surface coefficient, and the like of each lens component are not limited to the values shown in the numerical examples, and other values may be used.
In the embodiments, the description is made on the premise of the use of fixed focus, but a configuration capable of focusing is also possible. For example, the entire lens system may be extracted, or a part of the lenses may be moved on the optical axis to perform autofocusing (autofocus). [ Table 1]
Example 1
f＝2.84，Bf＝0.60，Fno.＝2.10，2ω＝79.0
*: aspherical surface
[ Table 2]
[ Table 3]
Example 2
f＝2.73，Bf＝0.53，Fno.＝2.10，2ω＝80.6
*: aspherical surface
[ Table 4]
[ Table 5]
Example 3
f＝2.78，Bf＝0.56，Fno.＝2.10，2ω＝79.8
*: aspherical surface
[ Table 6]
[ Table 7]
Example 4
f＝2.92，Bf＝0.63，Fno.＝2.10，2ω＝78.2
*: aspherical surface
[ Table 8]
[ Table 9]
Example 5
f＝2.92，Bf＝0.65，Fno.＝2.10，2ω＝74.4
*: aspherical surface
[ Table 10]
[ Table 11]
Example 6
f＝2.85，Bf＝0.58，Fno.＝2.09，2ω＝78.6
*: aspherical surface
[ Table 12]
[ Table 13]
The paraxial radius of curvature, the surface interval, the refractive index, and the abbe number were obtained by the following methods by experts involved in optical measurement.
The paraxial radius of curvature was measured with a lens using a super high precision three-dimensional measuring instrument UA3P (manufactured by Panasonic factory solutions) and was obtained in the following order. Temporarily setting paraxial radius of curvature Rm(m is a natural number) and a conic coefficient KmThe data is input to UA3P, and from these numerical values and measurement data, the n-th aspheric coefficient An of the aspheric shape expression is calculated using a fitting function (fitting) attached to UA 3P. In the above aspherical shape of formula (a), C is considered to be 1/Rm、KA＝Km-1. According to Rm、KmAn and aspherical shape, and calculating the height from the optical axisThe depth Z of the aspheric surface in the optical axis direction corresponds to the degree h. A difference between the calculated depth Z and the actual depth Z' is obtained at each height h from the optical axis, and it is determined whether the difference is within a predetermined range. On the other hand, when the difference is out of the predetermined range, the following processing is repeated until the difference between the depth Z calculated at each height h from the optical axis and the depth Z' of the actually measured value is within the predetermined range: r used for calculating the difference is changedmAnd KmIs set to be Rm+1And Km+1Then, these are input to UA3P, and the same processing as described above is performed to determine whether or not the difference between the depth Z calculated at each height h from the optical axis and the depth Z' of the actual measurement value is within a predetermined range. The predetermined range mentioned herein means within 200 nm. The range of h is a range corresponding to 0 to 1/5 or less of the maximum outer diameter of the lens.
The surface distance is determined by measuring the center thickness and surface distance using an ohumit sandfr (OptiSurf) (manufactured by holo optics) measuring device for measuring the length of the lens group.
The refractive index was measured using a precision refractometer KPR-2000 (manufactured by Shimadzu corporation) with the temperature of the object being measured at 25 ℃. The refractive index measured as d-line (wavelength 587.6nm) was set as Nd. Similarly, the refractive index measured in the e-line (wavelength 546.1nm) is Ne, the refractive index measured in the F-line (wavelength 486.1nm) is NF, the refractive index measured in the C-line (wavelength 656.3nm) is NC, and the refractive index measured in the g-line (wavelength 435.8nm) is Ng. The abbe number ν d for the d-line is calculated by substituting Nd, NF, and NC obtained by the above measurement into the formula ν d ═ Nd-1)/(NF-NC).
Claims (20)
1. An image pickup lens comprising 6 lenses, in order from an object side, comprising:
a 1 st lens having positive refractive power and a convex surface facing an object side;
a 2 nd lens having a negative refractive power;
a3 rd lens having positive refractive power and a convex surface facing the image side;
a 4 th lens having a positive refractive power;
a 5 th lens having a positive refractive power; and
a 6 th lens having a negative refractive power;
the imaging lens satisfies the following conditional expression (1-1):
f3/f is more than 2.6 and less than 15 (1-1), wherein,
f3 is the focal length of the 3 rd lens,
f is the focal length of the whole system.
2. The image pickup lens according to claim 1, wherein the 2 nd lens has a concave surface facing an object side.
3. The imaging lens according to claim 1 or 2, wherein the 6 th lens is a biconcave shape.
4. An image pickup lens comprising 6 lenses, in order from an object side, comprising:
a 1 st lens having positive refractive power and a convex surface facing an object side;
a 2 nd lens having negative refractive power and a concave surface facing the object side;
a3 rd lens having positive refractive power and a convex surface facing the image side;
a 4 th lens having a positive refractive power;
a 5 th lens having positive refractive power and a concave surface facing the object side; and
the 6 th lens is a biconcave shape.
5. The imaging lens according to claim 4, further satisfying the following conditional expression (1):
1 < f3/f < 25 (1), wherein
f3 is the focal length of the 3 rd lens,
f is the focal length of the whole system.
6. The imaging lens according to claim 1 or 4, characterized in that the following conditional expression (2) is further satisfied:
f234/f < -2.15 (2), wherein
f234 is a composite focal length of the 2 nd lens to the 4 th lens,
f is the focal length of the whole system.
7. The imaging lens according to claim 1 or 4, characterized in that the following conditional expression (3) is further satisfied:
0.23 < f/f3+ f/f4 < 0.8 (3), wherein
f3 is the focal length of the 3 rd lens,
f4 is the focal length of the 4 th lens,
f is the focal length of the whole system.
8. The imaging lens according to claim 1 or 4, characterized in that the following conditional expression (4) is further satisfied:
1.4 < f34/f < 3 (4), wherein
f34 is the combined focal length of the 3 rd lens and the 4 th lens,
f is the focal length of the whole system.
9. The imaging lens according to claim 1 or 4, characterized in that the following conditional expression (5) is further satisfied:
-550 < L2f/f < -3.3 (5), wherein
L2f is a paraxial radius of curvature of the object-side surface of the 2 nd lens,
f is the focal length of the whole system.
10. The imaging lens according to claim 1 or 4, further satisfying the following conditional expressions (6) to (7):
1.1＜CT3/CT4＜5 (6)，
v 3 is more than v 4 and (7), wherein
CT3 is the thickness of the 3 rd lens on the optical axis,
CT4 is the thickness of the 4 th lens on the optical axis,
ν 3 is the abbe number of the 3 rd lens with respect to the d-line,
ν 4 is an abbe number of the 4 th lens with respect to d-line.
11. The imaging lens according to claim 1 or 4, characterized in that the following conditional expression (8) is further satisfied:
0.5 < f.tan omega/L6 r < 20 (8), wherein
ω is a half value of the maximum angle of view in a state of focusing on an object at infinity,
l6r is a paraxial radius of curvature of a surface on the image side of the 6 th lens.
12. The imaging lens according to claim 1 or 4, characterized in that the following conditional expression (1-2) is further satisfied:
2.65 < f3/f < 9 (1-2), wherein
f3 is the focal length of the 3 rd lens,
f is the focal length of the whole system.
13. The imaging lens according to claim 1 or 4, characterized in that the following conditional expression (2-1) is further satisfied:
f234/f < -2.2 (2-1), wherein
f234 is a composite focal length of the 2 nd lens to the 4 th lens,
f is the focal length of the whole system.
14. The imaging lens according to claim 1 or 4, characterized in that the following conditional expression (3-1) is further satisfied:
0.25 < f/f3+ f/f4 < 0.65 (3-1), wherein
f3 is the focal length of the 3 rd lens,
f4 is the focal length of the 4 th lens,
f is the focal length of the whole system.
15. The imaging lens according to claim 1 or 4, characterized in that the following conditional expression (4-1) is further satisfied:
f34/f < 2.9 (4-1) of 1.6, wherein
f34 is the combined focal length of the 3 rd lens and the 4 th lens,
f is the focal length of the whole system.
16. The imaging lens according to claim 1 or 4, characterized in that the following conditional expression (5-1) is further satisfied:
-300 < L2f/f < -3.5 (5-1), wherein
L2f is a paraxial radius of curvature of the object-side surface of the 2 nd lens,
f is the focal length of the whole system.
17. The imaging lens according to claim 1 or 4, further satisfying the following conditional expressions (6-1) and (7):
1.3＜CT3/CT4＜4 (6-1)，
v 3 is more than v 4 and (7), wherein
CT3 is the thickness of the 3 rd lens on the optical axis,
CT4 is the thickness of the 4 th lens on the optical axis,
ν 3 is the abbe number of the 3 rd lens with respect to the d-line,
ν 4 is an abbe number of the 4 th lens with respect to d-line.
18. The imaging lens according to claim 1 or 4, further comprising an aperture stop disposed on an object side of a surface of the 2 nd lens on the object side.
19. The imaging lens according to claim 1 or 4, characterized in that the following conditional expression (1-3) is further satisfied:
2.7 < f3/f < 6 (1-3), wherein
f3 is the focal length of the 3 rd lens,
f is the focal length of the whole system.
20. An image pickup apparatus characterized by comprising the image pickup lens according to any one of claims 1 to 19.
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| JP2014046422A JP2015169889A (en) | 2014-03-10 | 2014-03-10 | Imaging lens and imaging apparatus including the imaging lens |
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| CN105866922A (en) * | 2015-11-09 | 2016-08-17 | 瑞声科技(新加坡)有限公司 | Camera lens |
| CN106908938A (en) * | 2017-04-05 | 2017-06-30 | 舜宇光学(中山)有限公司 | A kind of aspherical fish eye lens |
| CN107272151A (en) * | 2016-04-04 | 2017-10-20 | 康达智株式会社 | Pick-up lens |
| CN109669257A (en) * | 2015-09-30 | 2019-04-23 | 大立光电股份有限公司 | Imagery optical system, image-taking device and electronic device |
| WO2020062476A1 (en) * | 2018-09-29 | 2020-04-02 | 江西联益光学有限公司 | Miniature camera lens |
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2015
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- 2015-03-05 CN CN201520128018.XU patent/CN204595308U/en active Active
- 2015-03-06 TW TW104203321U patent/TWM509355U/en not_active IP Right Cessation
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Also Published As
| Publication number | Publication date |
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| US20150253547A1 (en) | 2015-09-10 |
| TWM509355U (en) | 2015-09-21 |
| JP2015169889A (en) | 2015-09-28 |
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